Yokogawa Touch Screen GP20 - Manual (Page 229)

2-45
IM 04L51B01-01EN
Operating the GX/GP
1
2
3
4
5
App
Modbus Log
Scroll
Communication type (C: client, M: master)
Date and time
Communication status
Recipient/error
Drag or flick
to scroll
Flag Description
C Communication by the Modbus client function (Ethernet)
M Communication by the Modbus master function (serial)
Status Factor Description
W Write
R Read
Blue
Normal communication.
Yellow
An external Modbus device returned an error response.
Orange
TCP connection in progress.
Red
Failed to connect to an external Modbus device.
Common
to colors
other than
blue
Skip Command not set.
INVALID Command cannot be executed.
WAITING Communication with an external device is congested. Waiting for
recovery. Check the connection with the external device.
CLOSED Modbus communication was stopped, and connection to the external
device was closed.
RESOLVING Server/slave connection being established (resolving address).
CONNNECTING Server/slave connection being established (requesting connection).
UNREACH The external device was not found on the network. Check the Modbus
server address setting and Ethernet cable connection.
TIMEOUT The response from the external device timed out. Check the
connection with the external device.
BROKEN A CRC error was detected in the serial communication with the external
device. Check the serial communication baud rate and other settings.
ERR_FC The external device returned an error response. Check whether the
Modbus registers are set correctly to match the external device. ERR_ADDR
ERR_VALUE
ERR_DEVICE
ERR_ACK
ERR_BUSY
ERR_NEGATIVE
ERR_GATE_PATH
ERR_GATE_
TARGET
BAD_SLAVE The external device returned an invalid response. Check whether the
external device is operating properly. BAD_FC
BAD_ADDR
BAD_NUM
BAD_CNT
VALID Modbus communication was established normally.
START Modbus communication started.
STOP Modbus communication stopped.
DROPOUT Failed to send all commands within the specified communication
interval. Check the number of Modbus commands and the baud rate.
2.3 Displaying Various Types of Information